Is the semi-daily wetness at the tip of the penis considered maniyy (seminal fluid), or is it an illness that necessitates a specific action?

If you are in doubt about whether what has exited is semen or prostatic fluid (madhiy), you may choose and assign to it the ruling you wish. If you are certain it is semen, then the default is that it is not a result of illness, and it necessitates ghusl (ritual purification bath) by consensus. Hasten to perform ghusl and do not delay the prayer until its time has expired.